In LaTeX is there a way to include the filename of a graphic into a caption?

I have a LaTeX document with a large number of drawings included from external files with \includegraphics{bla.pdf}. The drawings are done in Inkscape. This all works fine. However sometimes it is hard to keep track of all the drawings and their source files. Hence I'm looking for a way to include the source file name, in the example bla.pdf, into the caption. Not being a LaTeX expert I haven't found a way to automatically access the filename string from the caption. 开发者_如何学C Using Google-foo didn't yield a result either. Is there an existing way to refer to the filename and include it in the caption, like \caption{A fancy drawing of bla (\filename}?

You can capture the image filename by patching a part of the nested calls inside \includegraphics:

\documentclass{article}

\usepackage{graphicx,etoolbox}

\makeatletter
\patchcmd{\Gin@setfile}% <cmd>
  {\ProvidesFile}% <search>
  {\xdef\imgfilename{#3}\ProvidesFile}% <replace>
  {}{}% <success><failure>
\makeatother

\begin{document}

\begin{figure}
  \centering
  \includegraphics[width=.5\linewidth]{example-image}
  \caption{Image: \imgfilename}
\end{figure}

\end{document}

\imgfilename will contain the filename used in \includegraphics only after it's used.

Redefine \includegraphics. For the case of no arguments (width=3cm, scale=2 or something like this) we have

\let \saveinclude \includegraphics
\def \includegraphics#1{\def\filename{#1}\saveinclude{#1}}

The use

\includegraphics{bla.pdf}
\caption{A fancy drawing of bla (\filename)}